This Vienna bridge multi-band oscillator circuit was found in a 1974 Ferranti transistor manual. The circuit generates signals from 25 Hz to 1 MHz in 5 bands selected by the capacitors.
The accuracy of this circuit depends on the resistors connected to the band selection network. The...
In the figure we have a small general-purpose amplifier with the LM386 integrated circuit and...
With several integrated circuit options, this amplifier can provide different powers depending on the...